Use kibana as the web frontend to logstash.

Add a kibana module that installs kibana and flat configuration files,
and also disables the previous boring bland web frontend.

Change-Id: I772c66f07d2bc3a88128e101074be9d4162e3f8a
Reviewed-on: https://review.openstack.org/27089
Reviewed-by: Jesse Keating <jesse.keating@rackspace.com>
Reviewed-by: Clark Boylan <clark.boylan@gmail.com>
Reviewed-by: Jeremy Stanley <fungi@yuggoth.org>
Approved: Clark Boylan <clark.boylan@gmail.com>
Tested-by: Jenkins